Rivet joints, methods of riveting, types

what is rivets,types method and how to find efficiency of rivet joint,

1. Prepared by Muhammad Zohai b [email protected] 03077726278 Rivet joints, Methods of riveting, types & efficiency

2. RIVET A Rivet is a short cylindrical rod having a head and a tapered tail. The main body of the rivet is called shank One of the earliest methods of fastening metal together and most popular choices in today’s applications for it is known as the most reliable fasteners The rivets or used to make permanent fastening between the plates.

3. RIVET JOINT When two plates join by the rivets is called rivet joint. The rivets joint is used for joining light metals. Rivets joints strength is lower then to bolts. Rivers joints is used in industry application and aircraft industry Rivets joint is permanent fastener to joint the plates

4. MATERIALS OF RIVETS Rivets are generally made from steel. Grade 1(carbon steel) Grade 2 (carbon-manganese steel) The material of the rivets must be tough and ductile. They are usually made of steel,brass,aluminum,or copper, but when strength and a fluid tight joint is the main consideration, then the steel rivets are used Classic materials for aircraft rivets are aluminum, titanium, and nickel based alloys

5. TYPES OF RIVETS JOINT There are two types of riveting joint Lap joint Butt joint Lap joint A lap joint is that in which one plates overlaps the other and two plates are riveted together Lab joints )

6. BUTT JOINT A butt joint is that in which the main plates are kept in alignment touching each other and cover plate is placed either one side or on or on both side of the main plates Butt joints ( ต่อชน) cover plate main plate

7. METHOD OF RIVETING The function of rivets join to is to make a connection that has strength and tightness. The strength is necessary to prevent failure of joint. The tightness is necessary tin order to contribute to strength and prevent leakage as in a boiler or in ship hull. when two plates are to be fastener together by a rivet the holes in the plates are punched and drilled. Punching is the cheapest method and is used for relatively thin plates and in structural work. Since punching injuries the metal around the hole, therefore drilling is used in most pressure vessel work. In structural and pressure vessel riveting the diameter of the rivet hole is usually 1.5mm larger then the nominal diameter of the rivet

8. METHOD OF RIVETING In method of riveting when a cold rivet is used the process is known as cold riveting and when a hot rivet is used the process is known as hot riveting. The cold riveting process is used for structural joints and hot riveting is used to make leak proof joints. The riveting may be done by hand or a riveting machine. in hand riveting the original head is backed by a hammer or heavy bar and then the die or set is placed against the end to be headed and blows are applied by hammer thus cause the shank to expand thus filling the hole and tail is converted into a point.

9. METHOD OF RIVETING As the rivet cold it tend to contract. The lateral contraction will be slight, but there will be longitudinal tension introduced in the rivet which holds the plates firmly together In machine riveting , the die is a part of the hammer which is operated by air, hydraulic or steam pressure.

10. METHOD OF RIVETING

11. EFFICIENCY OF RIVETS JOINTS The efficiency of a riveted joint is defined as the ratio of the strength of riveted joint to the strength of the solid plate Strength of riveted joint=least of Pt Ps and Pc Strength of solid plate per pitch length P=p*t*$t

12. EFFICIENCY OF RIVETS JOINTS

13. APPLICATION OF RIVETS The rivets is used ships building bridges tanks and boiler shells. Aerospace industries use hundreds of thousands of solid rivets to assemble structural parts of an aircraft. rivets are used in structures where high joint strength is required

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